Use of a Laser Scanning System for Professional Preparation and Scene Assessment of Fire Rescue Units

The paper presents results of a study focused on usability of a 3D laser scanning system by fire rescue units during emergencies, respectively during preparations for inspection and tactical exercises. The first part of the study focuses on an applicability of a 3D scanner in relation to an accurate evaluation of a fire scene through digitization and creation of virtual walk-through of the fire scene. The second part deals with detailed documentation of access road to the place of intervention, including a simulation of the fire vehicle arrival

Opazovanje in simulacija nestabilnih pogojev med kontinuirnim litjem

Continuous casting comprises thermal, mechanical and chemical processes running in a complex system that contains a number of elements, such as a solidifying steel strand, a mould with an oscillation mechanism, a withdrawal mechanism, a water cooling sub-system with nozzles, several control sub-systems, etc. An external observer might see the process as robust and stable, but in reality there are fluctuations in the internal thermal and mechanical quantities, reflected in the structure and quality of the product. The research on unsteady behaviour of the quantities such as a solidifying strand temperature field, solid shell thickness and metallurgical length was conducted using an industrial diagnostic system DGS complemented with special measurement equipment and a thermal numerical model. Selected results of the monitoring and simulation of the non-standard process states are shown and analysed in the paper. Methods for determining the boundary conditions for the numerical model are also presented. The effect of the Leidenfrost phenomenon on the heat-transfer coefficient during water cooling by nozzles is also discussed. Since the determination of precise and immediate boundary conditions has technical limits, the model provides only smoothed values in time and space. As knowledge of the instantaneous state of the fluctuating process is a prerequisite for achieving quality and defect-free production, it is appropriate to complement the thermal numerical model by on-line monitoring of the machine's internal state. The results of the simulations are closely linked to the real process data.Kontinuirno litje obsega termične, mehanske in kemične procese, ki tečejo v kompleksnem sistemu, ki vsebuje vrsto elementov, kot so: strjujoča se jeklena žila (gredica), kokila z oscilacijskim mehanizmom, izvlečni mehanizem, vodno hlajenje s podsistemom hladilnih šob, več kontrolnih podsistemov itd. Zunanji opazovalec lahko vidi proces kot robusten in stabilen, toda v resnici imamo vrsto fluktuacij (nihanj) internih termičnih in mehanskih veličin in kakovosti produkta (nastajajoče konti lite gredice). Raziskave (časovno) nestabilnega obnašanja veličin, kot so: temperaturno polje strjujoče se konti gredice, debelina trdne skorje in metalurška dolžina, so avtorji prispevka izvajali z industrijskim diagnostičnim sistemom (DGS), dopolnjenim s specialno merilno opremo in termičnim numeričnim modelom. V članku avtorji predstavljajo izbrane rezultate analiz, opazovanja in simulacije nestandardni procesnih stanj. Prav tako predstavljajo metode določevanja robnih pogojev za numerični model. Diskusija obsega tudi t.i. Leidenfrostov fenomen in njegov vpliv na koeficient prenosa toplote med vodnim hlajenjem s šobami. Za natančno določitev vsakokratnih robnih pogojev obstajajo tehnične omejitve. Zato so v postavljenem modelu uporabljene le zglajene vrednosti v realnem času in prostoru. Poznavanje trenutnega stanja ves čas spreminjajočega stanja, je predpogoj za doseganje kvalitetne proizvodnje brez napak. Zato je primerno uporabljati termični numerični model s tekočim (on-line) oz. neposrednim spremljanjem internega stanja na konti livni napravi. Predstavljeni rezultati so tesno povezani z realnimi procesnimi podatki.Web of Science52211711

Hi-fi phenomenological description of eclipsing binary light variations as the basis for their period analysis

In-depth analysis of eclipsing binary (EB) observational data collected for several decades can inform us about a lot of astrophysically interesting processes taking place in the systems. We have developed a wide-ranging method for the phenomenological modelling of eclipsing binary phase curves that enables us to combine even very disparate sources of phase information. This approach is appropriate for the processing of both standard photometric series of eclipses and data from photometric surveys of all kind. We conclude that mid-eclipse times, determined using the latest version of our 'hi-fi' phenomenological light curve models, as well as their accuracy, are nearly the same as the values obtained using much more complex standard physical EB models.Comment: 4 pages, 3 figures, EAS - Proceedings of the conference: Setting a new standard in the analysis of binary stars, 16 to 19 September 2013, Leuven, Belgiu

Software implementation of a secure firmware update solution in an IoT context

The present paper is concerned with the secure delivery of firmware updates to Internet of Things (IoT) devices. Additionally, it deals with the design of a safe and secure bootloader for a UHF RFID reader. A software implementation of a secure firmware update solution is performed. The results show there is space to integrate even more security features into existing devices

Možnosti získání nových informací z policejní fotodokumentace a způsoby verifikace její kvality a přesnosti

Článek vychází ze současného stavu možností soudně znalecké analýzy dopravních nehod. V dnešní době jsou již velmi podrobně propracovány metody výpočtů nehodových dějů, chování modelů dopravních prostředků před střetem, během něj a po střetu. I přes rozsáhlý matematický popis chování jednotlivých entit při výpočtu se jedná o simulaci a výsledek je závislý na dosazených vstupních hodnotách a počátečních podmínkách. Tyto informace jsou nezastupitelné a jen obtížně je lze nahradit, neboť mají podstatný vliv na řešení nehodového děje a tedy i na výsledek znaleckého zkoumání